05_InstSolManual_PDF_Part10 - 5-10 Chapter 5 5.21 Set Up...

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5.21. Set Up: Take to be upward. After he leaves the ground the person travels upward 60 cm and his acceleration is downward. His weight is W so his mass is Solve: (a) (at the maximum height), gives (b) The free-body diagram for the person while he is pushing up against the ground is given in Figure 5.21. Figure 5.21 (c) For the jump, (from part (a)), gives gives Reflect: To accelerate the person upward during the jump, the upward force from the ground must exceed the down- ward pull of gravity. The ground pushes up on him because he pushes down on the ground. 5.22. Set Up: Let the acceleration be in the direction. Solve: (a) Apply to the four cars taken as a single object. The free-body diagram for this object is given in Figure 5.22a. m is the mass of one car and is the force that the engine exerts on the first car. Figure 5.22 gives and (b) Apply to the last three cars taken as a single object. The free-body diagram for this object is given in Figure 5.22b. is the force that the first car exerts on the second car. gives
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